Detachable bit for coal augers



DE'TACHABLE BIT FOR ,GOAL MJGERS Filed July 5 1922 A S14/vanto@ Patented Feb. 13, 1923.

Muro

Fica.

FRED MCLAUGHLIN, 0F CANTON, ILLINOIS.

vizaeracnaisnn BIT non COAL Aucuns.

Application filed July 5, 1922.

yof Illinois, have inventedcertain new andl useful Improvements in Detachable Bits for Coal Angers7 of which the following is a specification, reference being had `tothe vaccompanying drawings.

This `invention relates t0 detachable bits for boring ory drilling purposes, and pai'- ticularly to detachable bitsfor coal angers. It is common practice in coal mining for the bit to be turned from a part of the auger. Vlhile coal angers are made of ordinary auger steel7 this material is not adapted for forming cutting' bits, and the bit turned from a part of the auger is, of course, of steel no better than the auger itself. On the other hand, to make the entire auger of a special steel of a quality wear and abrasion would hibitive, as the need in the bit only,

make the cost profor a superior steel is The bit turned from a part of the auger is not of a character and temper that will defy punishment, particularly in drilling through sulphur and other hard substances. its of this character .wear rapidly even edges of thebits canV only be kept sharp by constant filing. Therefore7 the long angers have to be sent out of the mine whenever requiring new bits and each re-sharpening process shortensthe auger. It is necessary, therefore, for a minerto have with him a number of augers so in case one bit auger becomes too dull for use it may be sent to the surface while .another auger is used.

The object of my invention is to provide a detachable bit adapted to be clamped upon the extremity of the auger, this detachable bit being made of high duty steell so as to.A

secure the greatest possible toughness and cutting qualities for thel bit so that the bit will thereby stay number of bits made from ordinary steeL A further object is to provide a hit which may bel readily applied to ordinary coal angers with but slight modification in the shape of the coal auger and so constructed that the length and angles of its cutting edges are such as to produce a fast cutting auger and easy drilling.

A still further object is to provide a bit of this character whichis so formed that 'ably engaged guide thematerial into the threads of the which would stand y in soft coal, and the cutting auger, it wil] be seen sha-rpv outwea-r largev yl1, but the outer edge 18 serial No; 572,890.

itmay be relatively cheaply made by stamping and so formed that all that is necessary to do to fit the auger to the bit is to somewhat Hatten the extremity of the auger, which may be vreadily doneby blacksmithing. y 'y Another object is to provide wings detach-v with the bit which will act Ato auger, and which may be readily removed and replaced when worn or injured.

Still another ting bits of two y standard size, which are readily applied to all types or makes of coalaugers, both old and new. l y y Other objects will appear in the course of the following description.

My invention is illustrated in the accompanying drawings', wherein s* igure 1 is a side elevation of a coal vauger with my improved bit appliedy thereto;A

Figure 2 is an end View of the bit shown in Figure 1; a

F igure 3 a perspective'view of the bit detached from the auger;v c l Figure 4 isa perspective View of one of thebit sections; y

Figure 5 is an end view ofthe auger showing how the auger is flattenedfor use with my detachable bit.

Referring to these drawings, wherein .A`

designates a portion 'of the ordinary coal that my improved cutting bit is formed in two like sections or pieces, which I have designated l()l and 10a.

Each section consists of a transversely eX- tending portion l1, one end of which is anguarly'bent, as at 12 these transverseportions being aperturech yas at 13, for the passageof an attaching bolt. The bit section `14:' -is integralwith the transverse portion l1 lout'hasar width equal to approximately half the length of this transverse portion, and each bit section is .deiiected to ene side fromthe plane of the transverse portionll, as kat 15, and then is slightly twisted to'provide the bit proper 16. The inner edgel? of each cutting portion 1Q is approximately at right angles to the portlon yextends outward and .downward The'lOWer edge 19 is beveled or ground` to form a cutting edge and when the two bits are assembled, it .will be seen that the cutting edges ofy thejtwo bits object is to make the v cut-v interchangeabe parts Vof a which lies fiat against the transverse ineinber 11, the blank iroin which this part is made being bent to provide'the wing 2O which 'extends downward at an angle of about 450 to the upper edge tace of the base 21. The wing extends below the base plate 21 and the. `inner edge ot the wing is inwardly and downwardly curved, as at 22. The base plate 21 beyondv thel wing is inwardly flanged, as at 23i toeXtend beneath the movement. Passingl through the 'flat-tened endet ot the auger A and through the transverse portions 11 is a bolt 24 having a head on one end and carrying a nut Q5 on the opposite end.

1t will be seen that the flattened end e of the auger is formed at its junction with the twisted portion of the auger with a sh oulder a. An ordinary coal auger may be readily flattened by a blacksmith or it may be lflattened b y dies. It will be understood that under some circumstances the wings 20 may be lett oli?. Thus, for instance, where the auger is being' used for drilling in a horizontal plane or where the auger is drill-I ing upward, as in the roof oi the mine or at an upward inclination to the breast ot the coal, these wings will be omitted. llt will be noted that with this device the wings may be applied or omitted as desired.

It will be seen that bits et this character may be very` cheaply made of high. duty steel, that they may be readily applied to all types and makes of coal angers, and that after long usage they can be renewed by iiling or grinding, or that new bits may be disposed upon the augers in place of the old bits at any time. Thus augers equipped with these bits will last indefinitely. 1t will further be obvious that the services ot a blacksmith in constantly sharpening angers i is done away with, while at the same time a much superior bit is produced.

@ne of the advantages of the detachable bit which forms the subject matter of this application is that it does not have to lit the twist of the auger. lnasmuch angers have many diiierent pitches, it is impossible to ina-ke detachable bits which will fit the twists ot all auge-rs, but providing my bit and i'iattening 'the end of the auger, the bit is applicable to all angers no matter what the twist may be.

1. A detachable bit for coal angers formed portion 11 and lie against turningv being in approximate e ifrance? in two opposed complementary sections together adapted to vembrace and clamp the augerr between them., each section comprising a transversely extending auger-clamphaving a width equal ing portion and a blade length` ot to approximately one-halt of the the clamping portion7 twisted in opposite directions and each having a cutting edge, and wings carried .by each section in advance oi the corresponding blade and extending ydownward and laterally diagonally to the longitudinal axis ot the blade and adapted sections and adapted to pass through the auger.

2. A detachable bit for coal angers formed in two opposed complementary sections together adapted to embrace and clamp the auger between them, each section comprising a transversely extending auger-clamping portion angularly bent at one end, an integral blade having a width approximately equal to one-halt` the length ot the clamping` portion and extending downward toward that end ot the clamping portion remote from the angular end, the blades being twisted and the inner edges of the two blades ment with the longitudinal axis of the auger, wing carried by each section in advance ot the blade and extending downward and laterally diagonally to the longitudinal axis of the blade and the auger, and a bolt passing through the sections and adapted to pass 'through the auger.

3. A detachable bit for coal auge-rs formed in two opposed complementary sections together adapted to embrace and clamp the auger between them, each section comprisinga transversely extending auger-clamping portion angularly bent at one end, an integral blade having width approximately equal to one-haii the length ot' the clamping portion and extending downward trom that end ot the clamping portion remote trom the' angular end, the blades being twisted and the inner edges ot the two blades being` in approximate contact and in alignment with. the longitudinal axis oi" the au er, wii'igs associated with each blade, each. wing comprising afbase plate iittin against the transversely extending clamping portion ot the blade and having a flange engaging with an edge of the saidclamping portiom an integral wing portion extending approximately at right angles to the base the blades being to torni continuations o' the auger, and a bolt passing through the contact and in align- 4, A detachable bit for coal angers formed in two opposed, complementary sections adapted when placed together to form a relatively narrow, parallelsided auger'- clamping portion, each section having a blade, the blades being twisted in opposite directions and each having a cutting edge, and a bolt passing through the sections and adapted to pass through the auger.

5. A detachable bit for coal angers formed in two opposed, complementary sections adapted when placed together' to clamp the auger between them, each section comprising a transversely extending auger-Clamping portion, and a blade having a width equal to approximately one-half ot the length ot' the clamping portion, the blades of the two sections being twisted in opposite directions and each having a cutting edge.

6. A detachable bit for coal augers formed in two opposed, complementary sections adapted together to embrace and clamp the auger between them, each section comprising a transversely extending, flat, augerclamping portion angul arly bent at one end, an integral blade having a width approximately equal to one-half the length of the clamping portion and Aextending downward from that end of the clamping portion remote from the angulaiend, the blades being twisted and the inner edges of the two blades being in approximate contact and in alignment with the longitudinal axis of the auger, and a bolt passing through the clamping portions of thesections and adapted to pass through the auger.` i

7. The combination with a coal auger having a flattened, perforated extremity, of a detachable bit formed in two opposed., oomplementary sections together adapted to ernbrace andl clamp the flattened portion of the auger betweenthem,l each section comprising a transversely extending, flat, augerclamping portion angular-ly bent at-one end,

a blade carried by each section, the blades vbeing twisted and the inner edges of the two blades being in approximate contact and in alignment with. the longitudinal axis of the auger, and a bolt passing` through the clamping portions of the sections and through the aperture in the auger.

In testimony whereof I hereunto aiiix my signature.

man MeLAUe-HLIN 

